Reductive Chlorination and Bromination of Ketones via Trityl Hydrazones.

Reductive Chlorination and Bromination of Ketones via Trityl Hydrazones.
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DOI:
10.1002/anie.201510909
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发表时间:
2016-02-24
影响因子:
16.6
通讯作者:
Rawal, Viresh H.
Rawal, Viresh H.
中科院分区:
化学1区
文献类型:
--
作者:
Reyes, Julius R.;Rawal, Viresh H.

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A method is presented for the direct transformation of a ketone to the corresponding reduced alkyl chloride or bromide. The process involves the reaction of a ketone trityl hydrazone with t-BuOCl to give a diazene that readily collapses to the α-chlorocarbinyl radical, reduction of which by a hydrogen atom source gives the alkyl chloride product. The use of N-bromosuccinimide provides the corresponding alkyl bromide. This unique transformation provides a reductive halogenation that complements Barton’s redox-neutral vinyl halide synthesis. Halogen first, then hydrogen: Trityl hydrazones may be transformed by action of halonium ion sources to α-chloro and α-bromo carbinyl radicals, reduction of which affords the corresponding alkyl chlorides and alkyl bromides. Notably, this unique transformation is able to efficiently construct homoallylic and neopentyl chlorides and provides a reductive hydrazone halogenation complementary to Barton’s
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